蓝牙COM端口

Question

When I turn on the bluetooth on my laptop. I see there are 2 ports added under device manager COM&LPT

1. Why does it add 2 ports?

2. If I need to a read/write via bluetooth which port should I consider using?

Thanks.

Answer 1

If you're using Windows own Bluetooth software, two virtual port COM ports are created after pairing.

I believe one is being used for incoming connection requests and another is used to initiate connections to the device (outgoing).

To determine which one to "use" then please consider this post which should answer that for you.